Navigation Links
Study: Higher-protein diets support weight loss, but may lower bone density in postmenopausal women
Date:7/7/2010

WEST LAFAYETTE, Ind. - Overweight and moderately obese postmenopausal women using diets based on higher protein intake also need to be aware of potential bone loss, according to new research from Purdue University.

"We know that when overweight, postmenopausal women reduce their energy intake to successfully lose weight, they can lose less lean body mass when they consume higher amounts of protein and include lean meats, such as pork loins, ham, beef and chicken, in their diet," said Wayne W. Campbell, professor of foods and nutrition. "However, we also found that these older women lost bone mineral density faster than women who consumed normal protein diets that did not contain any meats. This finding is of concern for this age group that is susceptible to osteoporosis."

Campbell and doctoral student Minghua Tang analyzed data from two controlled diet studies. In the first study, they reduced 28 women's individual daily diets by 750 calories to achieve a one-and-one-half-pound weight loss each week for 12 weeks. These postmenopausal women ranged in age from 43-80. Fifteen women consumed meat-free diets with protein from vegetarian, dairy and egg sources, comprising 18 percent of each woman's energy intake. This amount of protein was comparable to the recommended dietary allowance of 0.36 grams of protein per pound of body weight per day.

The diets for the other 13 women were composed of 30 percent of energy from protein with 40 percent of the protein from lean pork, such as loin and ham, and 60 percent of the protein from vegetarian, dairy and egg sources. The women, on average, lost about 19 pounds each, but those who ate the higher-protein, meat-containing diet lost bone mineral density.

In the second study, 43 postmenopausal women each ate a 1,250-calorie diet for nine weeks. All participants consumed the same 1,000-calorie vegetarian diet, but 15 women received 250 calories from chicken breast meat, 14 women received 250 calories from beef tenderloin and 14 women received 250 calories from shortbread cookies and sugar-coated chocolates. Another 11 women served as the control group. The researchers saw again that all of the women who ate the energy-reduced diets successfully lost weight, but the groups that consumed the higher-protein meat-containing diets also lost bone mineral density compared to the control group.

The bone mineral density was measured using a dual-energy X-ray absorptiometer.

The findings are published online in the Journal of Gerontology: Medical Sciences and will be printed in September.

"Purposeful, moderate weight loss is an effective way for overweight postmenopausal women to improve their health and well-being," Campbell said. "However, research shows that older women are at risk of losing bone when they lose weight, and our findings highlight that amount and sources of protein are important to consider when choosing a weight-loss diet. Each individual needs to evaluate, or consult with a dietitian about how to achieve and sustain a healthy body weight and body composition, including muscle and bone."

Campbell and Tang indicate that more research is needed to better understand how different amounts and sources of protein impact bone when people lose weight.

"The impact of dietary protein on bone remains controversial, and information about dietary protein and bone from studies with weight-stable subjects might not be applicable to weight loss," Campbell said. "We know that bone is constantly forming and breaking down, and how fast these two processes occur determines the density of your bones. We don't have the data at this time to know the mechanisms involved with these changes in bone density.

"It is also important to note that these two studies were relatively short, nine to 12 weeks, so studies to evaluate how protein intakes impact body composition and bone beyond the period of active weight loss would be helpful."


'/>"/>

Contact: Amy Patterson Neubert
apatterson@purdue.edu
765-494-9723
Purdue University
Source:Eurekalert

Related medicine news :

1. U of Minnesota study: Americans worried about the quality of Gulf seafood
2. Teens and alcohol study: After a few drinks, parenting style kicks in
3. Study: Getting patients to take their asthma meds
4. Study: Specific PTSD symptoms related to anger and aggressiveness among Iraq/Afghanistan veterans
5. Study: Adults take their physical activity on the road
6. Study: Mining is a major driver of sub-Saharan Africas TB epidemic
7. U of M study: Monitoring cholesterol increases life expectancy
8. Study: ER computer keyboards and bacteria
9. Study: Prostate cancer patients weight linked to tumor size
10. Henry Ford Hospital study: Fewer infections with new heart-pump implant
11. Study: Yogurt-like drink DanActive reduced rate of common infections in daycare children
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... 25, 2016 , ... Conventional wisdom preaches the benefits of moderation, whether it’s ... setting the bar too high can result in disappointment, perhaps even self-loathing. However, those ... goal. , Research from PsychTests.com reveals that behind the tendency to ...
(Date:6/24/2016)... ... June 24, 2016 , ... Marcy was in a crisis. Her son James, eight, was out ... family verbally and physically. , “When something upset him, he couldn’t control his emotions,” remembers ... would throw rocks at my other children and say he was going to kill them. ...
(Date:6/24/2016)... ... June 24, 2016 , ... Comfort Keepers® of San ... Society and the Road To Recovery® program to drive cancer patients to and from ... adults to ensure the highest quality of life and ongoing independence. Getting to ...
(Date:6/24/2016)... New York, NY (PRWEB) , ... June 24, ... ... lifestyle publication Haute Living, is proud to recognize Dr. Barry M. Weintraub as ... believes that “the most beautiful women in the world, and the most handsome ...
(Date:6/24/2016)... ... ... Venture Construction Group (VCG) sponsors Luke’s Wings 5th Annual ... Country Club at 1201 Rockville Pike, Rockville, Maryland, 20852. The event raised funds ... been wounded in battle and their families. Venture Construction Group is a 2016 Silver ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... June 23, 2016 Research and ... Excipients Market by Type (Organic Chemical (Sugar, Petrochemical, Glycerin), ... Topical, Coating, Parenteral) - Global Forecast to 2021" ... The global pharmaceutical excipients market is projected ... CAGR of 6.1% in the forecast period 2016 to ...
(Date:6/23/2016)... DUBLIN , June 23, 2016 ... "Global MEMS Devices Medical Market Analysis 2016 - Forecast to ... The report contains up to date financial ... reliable analysis. Assessment of major trends with potential impact on ... dive analysis of market segmentation which comprises of sub markets, ...
(Date:6/23/2016)... 2016 Bracket , a leading clinical trial ... clinical outcomes platform, Bracket eCOA (SM) 6.0, at the ... – 30, 2016 in Philadelphia , Pennsylvania.  ... Assessment product of its kind to fully integrate with RTSM, ... eCOA 6.0 is a flexible platform for electronic clinical outcomes ...
Breaking Medicine Technology: